Helen is standing in the hallway with her friend janet, next to helen's locker. each girl has a body mass of 48 kilograms (kg), and thus each exerts a force of 470.4 newtons (n) on the hall floor. what is the total force, in newtons (n), that the hall floor exerts on the pair of girls?

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

Which additional product balances the reaction h2so4 + 2naoh → na2so4 + 2h2o 2oh h2o2 h3o

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents